tests: Avoid crasher with no arguments passed
tests: Avoid crasher with no arguments passed

https://bugzilla.gnome.org/show_bug.cgi?id=662418

pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser